* Ammonium ion (NH₄⁺): This is a positively charged ion formed by the combination of ammonia (NH₃) and a proton (H⁺).
* Phosphide ion (P³⁻): This is a negatively charged ion formed by the gain of three electrons by a phosphorus atom.
To form a neutral compound, the charges of the ions must balance. However, the charges of the ammonium ion (+1) and the phosphide ion (-3) are not compatible.
In conclusion, ammonium phosphide (NH₄P) is not a chemically feasible compound.
